I'm really confused now Alex
Does the 340 not run off 12v like all the other Garmins I've had? You simply stuff 12v in via the cradle leads (either directly off the battery or via the canbus lead or the 12v out socket) and the Garmin internal electrics take care of the 12v - 5v conversion.
-----------------------------------------------------------------------------------------------------------------
Updated after studying the 340 installation instructions and various YouTube vids....
The 340 does NOT take 12v like some other Garmin head units! The 340 is supplied with a power lead which incorporates a 12v to 5v transformer unit which 'can' be connected directly across the battery! However, I think it 'should' be connected via the CANbus adaptor cable so the transformer is electrically disconnected from the battery when the ignition is off!
-----------------------------------------------------------------------------------------------------------------
If you are thinking of somehow converting the 12v down to 5v and using the mini-USB socket, that won't be waterproof and you could bugger the Garmin. In fact on the 660 you can't even get at the mini-USB without taking the battery cover off which is a design feature as part of the waterproofing of the unit and that is what makes it a motorcycle Garmin as opposed to an un-waterproofed car unit!
I'm obviously missing the point somewhere, especially the bit about removing the cradle.
If you only intend to use the Garmin very infrequently (otherwise why remove the cradle?) then you could make good soldered connections from the cradle harness to the canbus adaptor plug with heat-shrunk sleeves for protection and then disconnect the canbus adaptor plug, harness and cradle as one unit when you don't want it on the bike!
It isn't as simple to remove the battery cover on the R as it is on the S or the GT (3 screws rather than two from memory
) but that way you could fit or remove the whole thing in a matter of a couple of minutes.
This way you retain total waterproof-ness (
) of the Garmin, don't need a separate 12v - 5v converter and don't need any more cables than the one you already have attached to the cradle and the adaptor cable you have already ordered.
Brian (whose brain hurts so he is taking it to bed with him for a nice long rest
)